As time has passed since being kidnapped, tortured, and almost killed, Yoosung is finding it hard to move on after what happened to him. Night after night he continues to struggle, his mind taking him back to that abandoned warehouse where Unknown kept him like a pet - a toy he could play with and do whatever he wanted to with. But now, things are different. He is back with the RFA and Emjay, and he knows that although he's terrified of those memories, everything will be okay. Or so he thought... As the members take a trip out to Rika's Safe house for the Summer for a short, well-deserved break, Yoosung's world is tipped upside down again when an unexpected visitor stumbles upon the house with one mission drilled into their brain: Kill Emjay.